user
  • 16 years ago
  • 2
  • 00:00

Transcript -- How a quarry works

Earth's physical resources: rocks for roads - for iPod/iPhone
0
توضیحات
Transcript -- Quarry managers explain how rock is formed and how they extract different layers of stone. Once blasted and processed, it is used to build roads.
صداپیشه ها
دسته بندی ها
Nature
Education
سنین
محتوای تمیز
تگ ها
فارسی